Glad to find it’s useful for someone besides me!
Supposedly, Google Chrome 23.whatever has “support” for Opus, but last I checked the developers were too busy being all gung-ho over “Chromoting” and “WebRTC” support and hadn’t ever bothered to check in support for plain old <audio> yet. (Their remote desktop is/will be using Opus for remote audio, and WebRTC has Opus as “mandatory to implement” to be compliant with the standard).

Hopefully they’ll remember <audio> exists one of these days and add it – I imagine it’s not a substantial amount of work now that it is apparently implemented for the other features.

Also, one of these days I need to get around to putting something up at opuscast.com…

Your audio test page came in very handy for testing the capabilities of the different browsers on the raspberry-pi, it’s also the first I’d heard of Opus, (which I’m a little bit ashamed of). So thank you!